As a research physicist, you have been called in to provide technical assistance

Question

As a research physicist, you have been called in to provide technical assistance to a science fiction film crew, The film plot centers on the investigation of a mysterious object found near a UFO crash site. The object is spherical and roughly 21.3 cm in diameter. According to the script, when scientists place a test instrument near the object, it registers an electric field of magnitude 1.930 times 106 N/C at a distance of 39 5 cm from its surface. Furthermore, they claim that the electric field strength is fairly constant at this distance from the surface. In the script, the scientists claim that such a charge is so enormous that the object must be extraterrestrial! Calculate the charge on the object according to the specifications listed in the script (Enter only a positive value.) Choose one of the following suggestions you would offer the script writers,

Explanation / Answer

sorry the distance is to be taken from the center of the sphere and not the surface.
E=Q/4r2
Q = (1.93X10^5)(.395+.1065)2/(8.9X10^9)
=5.45X10^-6 Coulomb

the charge is not unusual. the electric field needed is much larger

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